Know Your Environment. Protect Your Health.

Nitrate

Navarro Mills Water Supply Corporation

Nitrate, a fertilizer chemical, frequently contaminates drinking water due to agricultural and urban runoff, and discharges from municipal wastewater treatment plants and septic tanks. Excessive nitrate in water can cause oxygen deprivation in infants and increase the risk of cancer. Click here to read more about nitrate.

 

24

Samples

0

Samples exceeding legal limit (MCL)

10

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20180.243 ppm440.0142 ppm - 0.846 ppm
20190.560 ppm440.115 ppm - 1.41 ppm
20200.679 ppm440.0770 ppm - 2.32 ppm
20210.218 ppm440.0231 ppm - 0.416 ppm
20220.0770 ppm440.0400 ppm - 0.126 ppm
20230.149 ppm440.0213 ppm - 0.304 ppm

ppm = parts per million

State, National, and Health Guidelines for Drinking Water

EWG Health Guideline: 0.14 ppm

The EWG health guideline of 0.14 parts per million, or ppm, for nitrate and nitrite is based on the equivalent health guideline for nitrate, as defined in a peer-reviewed scientific study by EWG. This guideline represents a one-in-one-million annual cancer risk level.

EPA Maximum Contaminant
Level (MCL): 10 ppm

The legal limit for nitrate, established in 1962, was developed to protect infants from acute methemoglobinemia, a life-threatening disorder of oxygen transport in the body. This limit does not fully protect against the risk of cancer and harm to the developing fetus.

ppm = parts per million

All test results

Date Lab ID Result
2018-01-31Q18037180100.0645 ppm
2018-04-17Q18155840080.846 ppm
2018-07-19Q18287980010.0142 ppm
2018-10-23Q18427710010.0455 ppm
2019-02-06Q19058060060.496 ppm
2019-04-18Q19157920021.41 ppm
2019-07-31Q19494020010.115 ppm
2019-10-17Q19729950010.220 ppm
2020-01-29Q20035520040.0770 ppm
2020-04-14Q20147050012.32 ppm
2020-07-21Q20284100010.211 ppm
2020-10-23Q20413960010.108 ppm
2021-01-12Q21006750080.374 ppm
2021-04-12Q21092610010.416 ppm
2021-07-08Q21179260030.0603 ppm
2021-10-11Q21280820010.0231 ppm
2022-03-10Q22083010010.0400 ppm
2022-04-14Q22116160070.0715 ppm
2022-08-23Q22249930020.0705 ppm
2022-11-15Q22343120010.126 ppm
2023-02-15Q23062960010.304 ppm
2023-06-19Q23230930010.169 ppm
2023-09-06Q23384310010.0213 ppm
2023-10-31Q23465460010.103 ppm